[Developers] MQL link history for primitives_live

[Iain Sproat]

 I'm trying to get the history of user primitive count. I've got the below
query which gets my current primitive count, if the value of timestamp is
null.
My guess with specifying a timestamp value doesn't seem to work.
How do go about tweaking this to get my primitive count as_of a month ago?

[{
  "type":          "/type/link",
  "master_property": "/freebase/user_activity/primitives_live",
  "source": {
    "type": "/freebase/user_activity",
    "user": {
      "id": "/user/sprocketonline"
    }
  },
  "target_value": {
    "type":  null,
    "value": null
  },
  "filter:target_value>": 1000,
  "timestamp":    {"value":"2009-06-04T00:00:00.000Z"}
}]
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